Hint 1 - Electric/Str/Ensnare/Healing aura. 4 DU buff beam with reflection triangle around them. 6 stacked DST with two pointing at each crystal. Dump the rest of the DU into stacking LT's. I put my buff beam on the ledge, this keeps the kobolds that come out of the nearby doors from exploding on them. The light post will sit kind of in the middle of your  buff beam, so LT on one isde, DST on the other.

Hint 2 - Stack some Mage minions, I usually do 4-6 then 2 spiders, then dump the rest into stacking archers to help with ogres that come out of nearby doors

Not sure what stats are the minimum for this too work, I put down the stats for all my builders. I use a tower boost monk during waves, since some of the towers do take damage from kobolds , random snots that dont bounce and the rare ogre hit. You can start on wave 23 and then load extra toons in during wave 24 to get easy Propeller Cats. I've cleared survival with this build.